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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2183633d72d3e595a5e96219bf5988dd9ec710700f6ef422877d1cb7e9c0c8e2' 
  AND token = 'TNJvG9zFayj/v8HGQ6wzl5sLQ3DlhLac66Ncuuf4olo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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