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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c3cf3a29bbcc83bcd2552d67cd9e816bac2a42118d65e51a0e478e09d95cb4' 
  AND token = 'cgXbXwhZEPO5V2df5vgV/qJK1i+dnndp/Xcc1dfq4Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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