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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee575a4f6195b7ea9cf297b287f0665423ce73f0a0a7c328ff5a96df3f9a0cf' 
  AND token = 'tcBhp+G2/eih7VkqH8+Cplg1CbmnqDWaB1RP490h+jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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