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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86502f0a7fc0608c967f6ab59a6ebb9fa5ce99433cbc904d881a89651937dfe' 
  AND token = 'o3BoPkBQieeP+8Wo2UENWb2+DKEO74n8pmYL71oE+DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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