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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d6400f4496f0cb63b33c0ea64589b926c2c720d6189fa2b4f8bc4b88d43308' 
  AND token = 'ie1Jv2i1UzU4E+W6Q1naagn8EAwormtTDgAdFqxsXXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}