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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2c588d091e46a6f4d92f225d1d2612e67e50dfe0c3df8304983a118eadd063' 
  AND token = 'nSfKNBXQBlozzhl/MOJJI7ydM0Wno0vblS8WpHt1Vt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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