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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951e699db51b0518eee1d278d740b15b9f793d9c38c7f276f128fd6277eb4e8a' 
  AND token = 'LE2qv9ycP608JVBOyEoUFybWJ3YB4BPFJU+tOEIpJW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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