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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2e7f7020998e24744fe247fb7b07d39fae159c6413d2391d00565e0444d0c7' 
  AND token = 'nnqZ0lyli8XRCmHjmNnJIRuZlBiPQmxOBvZVpn8ccVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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